Update occurrence parameter description in regexp-replace

[OleksiiKovalov]

Clarified behavior of the occurrence parameter in regexp_replace.

[prmerger-automator]

@OleksiiKovalov : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 3eaca85:

✅ Validation status: passed

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[ktoliver]

@MikeRayMSFT

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[MikeRayMSFT]

Reviewing.

[MikeRayMSFT]

@abhimantiwari - please review

[learn-build-service-prod]

Learn Build status updates of commit 9fb76a7:

✅ Validation status: passed

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docs/t-sql/functions/regexp-replace-transact-sql.md	✅Succeeded

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[prmerger-automator]

PR 10230 has been merged from OleksiiKovalov:patch-17 to MicrosoftDocs:live by rwestMSFT.

@OleksiiKovalov, @abhimantiwari, @rwestMSFT

[learn-build-service-prod]

Learn Build status updates of commit 9126e55:

✅ Validation status: passed

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docs/t-sql/functions/regexp-replace-transact-sql.md	✅Succeeded

For more details, please refer to the build report.